Who said "The cycle of life and death is eternal."?

This quote is attributed to Swamp Thing.

The cycle of life and death is eternal. - Swamp Thing

"The cycle of life and death is eternal."

Swamp Thing Nature

"I am the swamp. The swamp is me."

"What was I? What am I now?"

"The man I was is gone. Only the swamp remains."

"They made me into this... this thing."

"Nature teaches us about beauty."

"Nature teaches us patience and wisdom"

"Sometimes it snows in April."

"Every town has a soul, and Twin Peaks has a troubled one."